I have installed the same product (Grasscel) here in Perth for the front yard which accesses the garages, so I actually turn on the grass and reverse into the garage. we have had it in place for almost twelve months now and I drive over it at least twice a day. It has held up really well. The grasscel product doesn't require the cracker dust or blue metal underlay, just levelled and compacted sand. we chose a hardwearing grass variety and have had no problems thus far. I would recommend it as it is really nice to have the coolness of the grass as opposed to any sort of hard surface driveway. The reticulation is installed prior to the laying of the cells and it looks after itself. We fertilise to keep the more trafficked areas green and leave the cut a little longer on the grass. Looks great! Very happy. I have tried to attach a couple of photos, but not uploading??

If you google grass cell, there are a number of manufacturers that make this product. It can be used for turf or stones/pebbles.

Jacey, nice to see you are still here, many aren't after this length of time. I'm having a little chuckle here as when I originally read your post, my first thought was "move house", but I didn't want to sound so rude as to say so. It reminded me of my first house which was at the flat end of the street but the other end was very much "mountain goat territory" and the driveways reminded me of yours. After living in the homes for years, some spent mega amounts removing rock and excavating to create a garage more at road level and from there the stairs started zig-zagging to the front entry, new front entries were even created at a lower level, but the stairs still continued inside the house, there was just no escaping the climb. I wondered how you even got your wheelie bins up and down the drive. Hope you are enjoying your new home, long term I think you made a very wise decision.

If you want a more accurate estimate, you can request a no-obligation quotation from https://www.rockinghamhomesecurity.com.au/. They provide a variety of driveway gates made to measure and custom made according to your requirements. Prices are competitive and their products are superior quality.